Specifications

Installation and Operation Manual Chapter 1 Introduction
MiRICi-E3T3 Ver. 2.2 Technical Specifications 1-5
1.3 Functional Description
Loop Detection
MiRICi-E3T3 incorporates a mechanism that detects loops on the WAN or the LAN
side by transmitting special loop detection frames. When the unit recognizes that
a loop exists, it reacts according to the following protocol:
• If a loop is detected on the LAN side, a loop detection alarm is sent.
• If a loop is detected on the WAN side, the unit blocks the traffic and a loop
detection alarm is sent.
Encapsulation
GFP
MiRICi-E3T3 supports GFP-F. This protocol maps each client frame into a single
GFP frame. GFP-F is used where the client signal is framed or packetized by the
client protocol. GFP-F is not supported in framed E3 mode.
HDLC/cHDLC
MiRICi-E3T3 supports HDLC and cHDLC. The HDLC/cHDLC protocol is a layer 2 data
transmission protocol that ensures error-free movement of data. It also provides
a flow control mechanism.
cHDLC is a Cisco propriety version of the HDLC protocol. One of the primary
reasons for the creation of cHDLC is to address the HDLC protocol's inability to
provide multiprotocol support. Thus, cHDLC frames contain a field for identifying
the network protocol being encapsulated.